Itâ€™s a CF.
I gave you that number from a Retul fit that I did on my retrofitted road bike with clip on aerobars. My reach was recorded as 396mm to pad rear on the fit report, so I added 45mm to it to get to center.
But I had a friend get me dialed in on the new Canyon and I just did a rough measurement myself for the reach (to pad center) itâ€™s set for right now (which feels pretty good) and it might closer to 455mm, although Iâ€™m kind of eyeballing it with a tape measure.
Hoping thatâ€™s enough to work with.
Okay, quick update here. I did what I think is a better measurement of reach and it's closer to 480mm the way my Canyon is currently set up.
Apologies for the lack of a super precise measurement on this! No idea why there would be such a big difference between my Retul report on the old bike and the current setup, both feel reasonably good to ride. It's really just the handlebars over the brakes that I'm concerned about, but I think it might be just fine the way it is.
This is interesting.... to pad center you have three progressively longer positions: 441mm (Rd bike w/ clip ons), 455mm after friend's fit on new Canyon CF, and then 480mm after a more accurate measurement. Here are my thoughts. The most important part of the fit is where your hips are over the bottom bracket. This is spoken of with the terms seat height and set back. That's the primary way you make the power that sends the bike forward so it gets dealt with first. To some extent the location of the bars (in this case the pads) speaks more to comfort and a bit aero-ness. You kinda have to think of the saddle as the first step and then the pads end up where they are because of where the saddle is.... the saddle informs the pads.
The saddle on your road bike was prolly way back behind the bottom bracket and that informed the pads location as farther back too. Your new Canyon CF has a steeper seat angle, the saddle has the ability to move forward over the bottom bracket and as it moves forward the pads move forward too. This is good, you want that.
So let's now circle back to the original question which is, essentially, Pad Y is 638 and Pad X is now 480 - is the medium CF right for you? My answer is yes, you're in a pretty good place on the range of that bike. And just so you know, the large is too long for you; the minimum Pad X is 488 and that's almost a centimeter longer than where you are. The small is too short for you; max Pad X is 472.
You're initial complaint was "When I pop up and use the handlebars, however, I feel a bit far forward" This makes sense to me - you're not on your road bike any more. Your hips are over the BB (as noted above), your upper body is over the front wheel, and you're lower (read: out of the wind) from the road bike with clip-ons. This is the triathlon/time trail position. This is how it's supposed to be. All tri bikes are designed to be ridden in aero and fit to be ridden in aero. That said, we still have to come up to the base bar often for safety: braking, a more stable grip for sharp turns, descending, etc. - that's fine, but once past the techy bit we're back in aero where we are faster. This works because the vast majority of triathlon bike courses are pretty flat and straight - we're not allowed to draft (in the typical age group format) so the priority is to be comfortable in aero so we can make good power and slip through the wind with a smaller frontal area than if we were upright on higher bars.
Now... I'm leaving the bike fitter zone for a sec and putting on my coaches hat. Being a technically good bike rider matters. I've seen hundreds of fit athletes with big engines who are slow on the bike because they haven't taken the time to learn bike skills. If you invest in learning to ride the position of this new bike you'll be faster through corners, in cross winds, around u-turns, on descents, while drinking, while eating, etc. Take that time.
Ian Murray http://www.TriathlonTrainingSeries.com
I'm all about athletes mastering triathlon
Twitter - @TriCoachIan